[Tutor] Random list exercise
joel.goldstick at gmail.com
Thu Sep 9 23:42:54 CEST 2010
On Thu, Sep 9, 2010 at 4:51 PM, lists <lists at justuber.com> wrote:
> Hi tutors,
> Still on my Python learning journey! I've just competed an exercise
> which asks the student to "Create a program that creates a list of
> words in random order. This program should print all the words and not
> repeat any." I've printed the list for my own needs. The list
> randwords aims to answer the specific request of the exercise author.
> If anyone has the inclination and a minute to spare, please run your
> eyes over my answer. It works, but is it an OK way to approach the
> Thanks again :-D
> import random
> words = ["one", "two", "three", "four", "five", "six", "seven",
> "eight", "nine", "ten", "eleven"]
> randwords = 
> while words: #has entries in it
> wordslen = len(words) #get the length of the list
> index = random.randint(0, wordslen -1) #get a random index
> chosenword = words[index]
> randwords.append(chosenword) #append the random word to a new list
> del words[index] #del the word from the old list
> for word in randwords:
> print word # print them
Several small and not so small points:
1. you assign wordslen each pass through your loop. While it doesn't matter
in a small loop, it wastes time on the order of the size of your list.
Instead move wordslen = len(... above your while loop. Any time you put
code in a loop that doesn't change in each iteration, you should move it out
of the loop.
2. since you only use chosenword once in your loop, you could remove
chosenword = words[index] line and replace chosenword in the append(... with
3. your list doesn't contain any duplicate words. Since your program is
supposed to catch this, you should add a duplicate to see if it works.
4. I think your line del words[index] is supposed to help out with item 3
but it doesn't. It just removes the word you just used selected.
5. And finally, I think you want to print
Just minor points. nice job -- getting there
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